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- Title
Learning about flavour structure from τ→ e γ and μ→ eγ?
- Authors
Davidson, Sacha
- Abstract
Current and upcoming experiments should improve the sensitivity to e→ e γ decays by an order of magnitude. This paper assumes that one of the τ→ e γ decays is observed, and explores the structure and consequences of the required new flavoured couplings. In simple models (a low-scale seesaw, leptoquarks) it is shown that the dipole vertex function is proportional to a product of flavoured matrices from the Lagrangian (a 'Jarlskog-like' invariant), provided that the loop particles are weakly coupled to the Higgs. Secondly, if the dipole vertex function has a hierarchical structure, this might imply that only some of the τ→ e γ modes can be observed, due to the 'approximate zero' implied by the bound on μ→ eγ. The assumptions underlying this potential test of a hierarchical structure are discussed.
- Subjects
FLAVOR in particle physics; PHYSICS experiments; LAGRANGE equations; SENSITIVITY analysis; GRAND unified theories (Nuclear physics); GAMMA decay; HIGGS bosons
- Publication
European Physical Journal C -- Particles & Fields, 2012, Vol 72, Issue 2, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-012-1897-1